Principal Wastewater Modeller

Principal Wastewater Modeller – Edinburgh and Glasgow offices, hybrid working model.

• Serves as the principal technical advisor and subject matter expert for wastewater system modeling and analysis, providing guidance to project teams and junior staff.
• Provides specialised technical input to planning studies, alternatives analyses, and design related to wastewater collection, conveyance, treatment, and wet weather system performance.
• Develops, maintains, and standardises wastewater modeling methodologies, procedures, and best practices to ensure high‑quality, defensible, and cost‑effective technical work.
• Leads and participates in interdisciplinary reviews of planning, modeling, and design deliverables to ensure consistency between hydraulic modeling, process design, and overall project objectives.
• Develops and reviews planning‑level and design‑level cost estimates, including capital improvement costs and level‑of‑effort estimates for modeling and technical analyses.
• Applies expert knowledge across all phases of wastewater modeling contributions to PS&E packages, including flow development, model calibration, capacity analysis, and support of design criteria.
• Performs quality control and peer review of hydraulic and process model setups, assumptions, calculations, and technical documentation.
• Prepares and reviews technical memoranda, modeling reports, and specification sections related to wastewater modeling, data requirements, and performance criteria.
• Provides technical input to the development of engineering budgets, schedules, and work plans, ensuring modeling tasks are appropriately scoped and aligned with regulatory and project requirements.

• A degree (or equivalent) in Civil Engineering, Environmental Sciences, GIS, Geography, or a similar subject.
• Chartered member or approaching chartership with ICE or CIWEM.
• Extensive experience in wastewater modeling.
• Strong proficiency in GIS and data analysis to support wastewater modeling, particularly using ArcGIS for network development, spatial data management, and results visualization.
• Understanding of wastewater hydrology and hydraulics, including dry weather flow, wet weather flow, infiltration and inflow (I/I), and climate change impacts, within the UK and international regulatory contexts.
• Proven experience with wastewater and integrated urban drainage modeling platforms such as Innovyze Info Works ICM (wastewater modules), Info Works WS Pro, SWMM, or equivalent tools used for sewer system and integrated catchment modeling.
• Demonstrated experience acting as a technical lead for wastewater modeling projects, responsible for model strategy, quality assurance, client interface, and mentoring junior modelers.
• Strong background in water and wastewater consultancy, delivering planning, regulatory, and capital improvement projects for utilities and public‑sector clients.

Career development opportunities, technical practice networks, AECOM University, volunteering days, flexible hybrid working model, personalised benefits, and support for part‑time or flexible arrangements.

We celebrate diversity, including neurodiversity, and welcome applications from all backgrounds and abilities. We are a Disability Confident Employer and will offer an interview to applicants who have a disability or long‑term condition, who meet the minimum or essential criteria for the role. Reasonable accommodation can be provided for the application process.

All your information will be kept confidential according to EEO guidelines.